Structure and Magnetism of the Rh4+-containing perovskite oxides La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3

HASANLI, Nijat, SCRIMSHIRE, Alex, BINGHAM, Paul, PALGRAVE, Robert and HAYWARD, Michael (2020). Structure and Magnetism of the Rh4+-containing perovskite oxides La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3. Dalton Transactions: an international journal of inorganic chemistry, 49, 11346-11353.

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Open Access URL: https://pubs.rsc.org/en/content/articlelanding/202... (Published version)
Link to published version:: https://doi.org/10.1039/D0DT02466J
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    Abstract

    Synchrotron X-ray powder diffraction data indicate that La0.5Sr0.5Mn0.5Rh0.5O3 and La0.5Sr0.5Fe0.5Rh0.5O3 adopt distorted perovskite structures (space group Pnma) with A-site and B-site cation disorder. A combination of XPS and 57Fe Mössbauer data indicate the transition metal cations in the two phases adopt Mn3+/Rh4+ and Fe3+/Rh4+ oxidation state combinations respectively. Transport data indicate both phases are insulating, with ρ vs. T dependences consistent with 3D variable-range hopping. Magnetisation data reveal that La0.5Sr0.5Mn0.5Rh0.5O3 adopts a ferromagnetic state below Tc ∼ 60 K, which is rationalized on the basis of coupling via a dynamic Jahn–Teller distortion mechanism. In contrast, magnetic data reveal La0.5Sr0.5Fe0.5Rh0.5O3 undergoes a transition to a spin-glass state at T ∼ 45 K, attributed to frustration between nearest-neighbour Fe–Rh and next-nearest-neighbour Fe–Fe couplings.

    Item Type: Article
    Uncontrolled Keywords: 0302 Inorganic Chemistry; 0307 Theoretical and Computational Chemistry; 0399 Other Chemical Sciences; Inorganic & Nuclear Chemistry
    Identification Number: https://doi.org/10.1039/D0DT02466J
    Page Range: 11346-11353
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 04 Aug 2020 09:16
    Last Modified: 24 Aug 2020 15:30
    URI: http://shura.shu.ac.uk/id/eprint/26857

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